A portable breathing device used during firefighting is called a Protective Breathing Equipment (PBE).

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Protective Breathing Equipment is the portable, quickly donned air source used in firefighting to provide breathable air in smoky environments. It’s typically a hooded unit with its own air supply, designed for rapid use during entry or escape, offering immediate protection while crews prepare for longer protection with other gear. This distinguishes it from a self-contained breathing apparatus, which is a heavier, back-mounted system intended for longer durations; from an oxygen mask kit, which is just a mask with limited air supply; and from a smoke hood, which provides basic protection with a much simpler air delivery. So, the term Protective Breathing Equipment precisely describes the portable breathing device used in firefighting.